Compare Value of Two Text Items in Trigger Expression

[JustinAddams]

Hi guys,

Im attempting to create a trigger that alerts if two items do not contain the same value.
This seems to be very simple if the items are Integers and impossible if the items are Text, am just hoping if anyone can shed some light on the matter.

I attempted to follow the information provided under https://www.zabbix.com/forum/zabbix-...cond-missmatch
But that didn't work.

And if i write the Trigger like this

{Template - Debug:debug.debug_charlie.last()} = {Template - Debug:debug.debug_delta.last()} = 0

I just get evaluation errors as the Strings arent Numbers.

Cannot evaluate expression: expected numeric token at "Va) = (Va) = 0"

[JustinAddams]

Taking into account the existence of this Issue https://support.zabbix.com/browse/ZBXNEXT-702

And this line in the documentation

1) All functions return numeric values only. Comparison to strings is not supported, for example.

I'm starting to think this is impossible and that the examples provided in the other Forum Post are missing key pieces such as a hardcoded string to find in the .str() function.

If anyone can confirm it'd be appreciated.

[brunohl]

Any update on this one?

[splitek]

If you using Zabbix 4, you can try write preprocessing rule with JavaScript to calculate some hash for text, so you can compare this two hashes.
Ofc hash need to be number only.

[brunohl]

Yeah, I made it work converting to a float value, but it got truncated. But I guess it will work as there are many decimal places. Thanks anyway

[JustinAddams]

Only just checked the forum, forgot to setup notifications.
Thanks for the great idea!

[gofree]

shre it pls last tiem I had to do it via ext bash script - version 4.0.x didnt have the java script capability

[brunohl]

Actually I didn't make via pre-processing but by my JS external script. What I would return like "f760f5a2f0e7c50ae361a394152c5d3f"
I converted through this function:

obj.convertMd5ToNum = function ( hash ) {
    var newHash = '1.';
    for (var i in hash) {
      newHash += hash.charCodeAt(i);
    }
    return parseFloat( newHash );
  }

To:
1.1025554481025397

[Bintao]

If you just put in "f760f5a" you'll get same 'newHash'. I was trying to use this script to detect if two IP addresses is different, unfortunately it doesn't help

[richlv]

String comparison in triggers is supported since Zabbix 5.0:

https://www.zabbix.com/documentation/5.0/manual/introduction/whatsnew500#string_comparison_allowed

[JustinAddams]

I better get around to my 5.x upgrade then!
Thanks for the tip.